docs: def load_pickle(file, encoding=None):
      """Load a pickle file.
  
      Args:
          file (str): Path to pickle file
  
      Returns:
          object: Loaded object from pickle file
  
      """
      # TODO: test set encoding='latin1' for 2/3 incompatibility
      if encoding:
          with open(file, 'rb') as f:
              return pickle.load(f, encoding=encoding)
  
      with open(file, 'rb') as f:
         return pickle.load(f)